Recall reading an article by Jimmy Edwards when he claimed to have spent some time flying the immortal Fairey Battle (after it had been ignominiously retired from frontline service) as a target tower.
Allegedly, one day while droning across the south of England with mind in neutral he looked up and was horrified to see an echelon of Messerschmidts perfectly positioned above him.
Before he had time to react, they peeled off - and shot hell out of the target! They then formed up, flew past while the leader saluted him. It was a crack squadron - and they considered it beneath their dignity to shoot down a Fairey Battle.
I do hope it might be true.